/**
 * COOKIE存储
 * @param {String} key 
 * @param {String} val 
 * @param {Number} time 
 */
function setCookie(key,val,time=10){
    if(typeof val=='object') val=JSON.stringify(val)
    const d=new Date
    d.setTime( d.getTime() - 1000*60*60*8 + 1000*time )
    document.cookie=`${key}=${val}; expires=${d}`

}
/**
 * COOKIE获取
 * @param {String} key 
 * @returns String
 */
function getCookie(key){
    let arr=document.cookie.split('; ')
    for(let i=0;i<arr.length;i++){
        let item=arr[i]
        let tempArr=item.split('=')
        if(tempArr[0]==key) return tempArr[1]
    }
}

/**
 * COOKIE删除
 * @param {String} key 
 * @returns undefined
 */
function removeCookie(key){
    setCookie(key,null,-1)
}